chemistry - electrolysis + half equations

electricity

what type of energy source does electrolysis use?

Al

The half equation for the reaction that happens during aluminium manufacture is shown below, what symbol completes it?

2

What should be the missing number be to balance this half equation?

cathode

at which electrode will Copper 2+ gain 2 electrons and become Copper?

reduced, cathode

positive ions are _______ (gain) at the ________ (electrode)

electrolysis

what process is usually used to extract metals that are more reactive that carbon

electrolysis

the process in which an electric current is used to produce a chemical reaction, such as the decomposition of water

cryolite

what is aluminum oxide often mixed with to reduce the melting point

aluminum metal

what is extracted from aluminum oxide by electrolysis

graphite

what are positive electrons made of

negative oxide ions

which ions in aluminum oxide will be attracted to the positive electrodes

cathode

metal ions are attracted to which electrode during electrolysis?

cathode

negative electrode at which reduction occurs

anode

positive electrode at which oxidation occurs

positive

what ion does hydrogen form

cathode

hydrogen ions are attracted to which electrode during electrolysis?

sodium

during the electrolysis of molten sodium chloride, which ion discharges at the cathode

chlorine

during the electrolysis, of molten sodium chloride which Ion discharges at the anode

aluminum oxide

what is the name of this important compound found in aluminum ore

reacts with oxygen and corrodes

why should the carbon anode be replaced regularly?

reduced

positive metal ions are

oxidised

negative non metal ions are

uncharged, discharged

as ions gain or lose electrons they form the ______ element and are ________ from the electrolyte

1+ ions

group 1 alkali metals form

2+ ions

group 2 metals form

-2 ions

group 6 transition metals from

-1 ions

group 7 halogens form